642425025 has 24 divisors (see below), whose sum is σ = 1158702624. Its totient is φ = 311478400.

The previous prime is 642425009. The next prime is 642425101. The reversal of 642425025 is 520524246.

It is a happy number.

It is not a de Polignac number, because 642425025 - 2⁴ = 642425009 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642424983 and 642425001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388524 + ... + 390173.

It is an arithmetic number, because the mean of its divisors is an integer number (48279276).

Almost surely, 2^642425025 is an apocalyptic number.

It is an amenable number.

642425025 is a deficient number, since it is larger than the sum of its proper divisors (516277599).

642425025 is a wasteful number, since it uses less digits than its factorization.

642425025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778721 (or 778716 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 642425025 is about 25346.1047303131. The cubic root of 642425025 is about 862.8609537308.

The spelling of 642425025 in words is "six hundred forty-two million, four hundred twenty-five thousand, twenty-five".